Segment Information Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Net sales	$ 221,290	$ 217,100
Operating profit (loss)	25,850	35,210
Operating Segments [Member] | Packaging [Member]
Segment Reporting Information [Line Items]
Net sales	88,840	88,200
Operating profit (loss)	17,640	19,580
Operating Segments [Member] | Aerospace [Member]
Segment Reporting Information [Line Items]
Net sales	38,330	37,790
Operating profit (loss)	5,740	4,590
Operating Segments [Member] | Specialty Products [Member]
Segment Reporting Information [Line Items]
Net sales	94,120	91,110
Operating profit (loss)	10,860	10,140
Corporate, Non-Segment [Member] | Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Operating profit (loss)	$ (8,390)	900	[1]
Selling, General and Administrative Expenses [Member]
Segment Reporting Information, Additional Information [Abstract]
Loss Contingency Accrual, Period Increase (Decrease)		$ (8,200)

[1] During the first quarter of 2018, the Company removed an obligation from its balance sheet, resulting in an approximate $8.2 million non-cash reduction in selling, general and administrative expenses. See Note 11, "Commitments and Contingencies," for further details.